Colnago G5-X geometryGravel · 2026 · 5 sizes, from 450 to 570
The Colnago G5-X is a gravel bike available in 5 sizes, from 450 to 570. Stack ranges from 536 to 613 mm and reach from 377 to 411 mm. Its position sits between racing and endurance. All sizes share 435 mm chainstays.
What size G5-X do I need?
Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.
Enter your stack and reach to see which size fits you best.
Geometry chart by size
Measurements in mm and degrees, as published by Colnago. The ones that matter most for choosing a size are in bold.
| Size | 450 | 480 | 510 | 540 | 570 |
|---|---|---|---|---|---|
| Stack | 536 | 555 | 573 | 591 | 613 |
| Reach | 377 | 385 | 392 | 401 | 411 |
| Effective top tube | 512 | 530 | 547 | 567 | 584 |
| Head angle | 70.5° | 70.5° | 71.0° | 71.0° | 71.5° |
| Chainstay length | 435 | 435 | 435 | 435 | 435 |
| Front centre | 599 | 613 | 622 | 637 | 649 |
| BB drop | 80 | 80 | 80 | 78 | 75 |
| Seat angle (method not stated) | 74.5° | 74.0° | 73.5° | 73.0° | 73.0° |
Source: Colnago official website · data from 11 Nov 2026. Spot a mistake?
Stack and reach of every size
Higher means a taller front end; further right means a longer reach. The blue dot is your search.
Character of each size
Compared with other gravel bikes. Further right means more of that quality.
Bikes with similar geometry (size 510)
The closest size of other gravel models, by stack and reach.
Frequently asked questions
What size G5-X do I need?
It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 536/377 mm in size 450 to 613/411 mm in size 570). The size finder on this page shows the closest size and the stem and spacers you would need.
What are the stack and reach of the G5-X in size 510?
Stack of 573 mm and reach of 392 mm, with an effective top tube of 547 mm and a head angle of 71.0°.
Is the G5-X a racing or an endurance bike?
In between. In size 510 its stack-to-reach ratio is at percentile 45 of gravel bikes: neither very low nor very tall.